Al Gifford checks a cable on the phase time measurement system in the Clock Test Facility at the Naval Research Laboratory (NRL). The system measures the absolute phase of 48 clocks simultaneously and 900 analog signals per hour

The original finding aid described this photograph as:

Base: Washington

State: District Of Columbia (DC)

Country: United States Of America (USA)

Scene Camera Operator: Michael Savell

Release Status: Released to Public
Combined Military Service Digital Photographic Files